Set of 6 grade 8 flywheel bolts. 1" under head length 7/16x20 thread with 9/16 6 point head. These bolts are recommended for the bert htd, bert non htd, and winters non htd 18 spline flywheels. These are too short for the brinn and the flex plate with flange. Use 1.250 under head length for them.